Android監聽WIFI網絡的變化并且獲得當前信號強度
MainActivity如下:
WifiChangeBroadcastReceiver如下:
package cc.testwifi;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
public class WifiChangeBroadcastReceiver extends BroadcastReceiver {
private Context mContext;
@Override
public void onReceive(Context context, Intent intent) {
mContext=context;
System.out.println("Wifi發生變化");
getWifiInfo();
}
private void getWifiInfo() {
WifiManager wifiManager = (WifiManager) mContext.getSystemService(mContext.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
if (wifiInfo.getBSSID() != null) {
//wifi名稱
String ssid = wifiInfo.getSSID();
//wifi信號強度
int signalLevel = WifiManager.calculateSignalLevel(wifiInfo.getRssi(), 5);
//wifi速度
int speed = wifiInfo.getLinkSpeed();
//wifi速度單位
String units = WifiInfo.LINK_SPEED_UNITS;
System.out.println("ssid="+ssid+",signalLevel="+signalLevel+",speed="+speed+",units="+units);
}
}
}
AndroidManifest.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cc.testwifi"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="10" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="cc.testwifi.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name="cc.testwifi.WifiChangeBroadcastReceiver">
<intent-filter >
<action android:name="android.net.wifi.RSSI_CHANGED" />
</intent-filter>
</receiver>
</application>
</manifest>
main.xml如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="監聽wifi變化并獲得當前信號強度"
android:layout_centerHorizontal="true"
android:layout_marginTop="50dip"
/>
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